Phase out zinc oxide and add health benefits

European Protein, May 20th 2019

Copenhagen University and Fermentationexperts, which produces a complementary lactic acid fermented protein, just finished testing different complementary feeds’ ability to replace zinc oxide in pig production without increasing the amount of antibiotics used or the farmer’s production cost. The results will be made public at the ZERO ZINC Summit in Copenhagen, Denmark, on the 17th and 18th of June.

“We often see feeding trials where protein has been reduced to minimize diarrhoea – this affects the growth and has a negative impact on the farmers bottom line. We need to present a solution with a standard amount of protein, that is financially sustainable for the farmer”, says Jens Legarth, CEO of Fermentationexperts.

The feeding regimes

Consequently, a trial on three groups of pigs with the three following feed regimes was carried out:

  1. Basic diet – control group
  2. Basic diet added 2.500 ppm zinc oxide group
  3. Basic diet added 10 % EP100i group

All diets contained the standard amount of protein added highly digestible plant protein. The results are both, on the one hand, expected and on the other hand, very surprising for EUROPEAN PROTEIN.

“We learned from a pilot study that we can replace zinc without increasing mortality and feed cost for the farmer. It was new to us, that prescribed zinc seemed to damage the immune system hampering the inflammation response in the gut. We now have enough evidence to prove, that fermented plant protein does the exact opposite, namely enforcing the immune system and thereby reducing the risk of gut inflammation.”, Jens Legarth concludes.

Zinc influences the gut bacteria – just as fermented protein

The diversity in the gut bacteria and the balance of beneficial versus commensal bacteria in the gut are essential for the pig’s overall health and well-being.

The trial showed that zinc oxide increased the diversity of the bacteria and allowed much more lactic acid bacteria to be present in the gut. The beneficial bacteria then repressed the bacteria causing illness and created a balanced gut that supports pig health. This is one of the reasons why zinc oxide effectively handles diarrhoea.

When comparing the diversity and balance of the three feeding regimes, it was found that lactic acid fermented protein altered the gut bacteria very similarly to zinc oxide. In both cases, the number of lactic acid bacteria doubled, the diversity improved, and the balance was restored. However, the basal diet did not positively influence the diversity, nor did it promote lactic acid bacteria.

“We didn’t expect to find that zinc oxide has a similar modulating effect on the gut bacteria as fermented protein. The similarity is striking, and might be the reason as to why EP100i has been successful when it comes to supporting gut health, says Jens Legarth.”

Previous trials showed that the diversity created by EP100i is consistent when the supplement is added – and that the supplement won’t trigger resistance.

The right feed improves the immune system and feed uptake

The immune system of the young piglets is fragile and easily influenced by the complementary feeding solutions supplemented. Therefore, ensuring that a well-functioning immune system is developed makes sense for both the pig’s well-being and the bottom line when battling illness and ensuring a better feed uptake. The trial shows that the right feed can make a difference in the development of the immune system and feed uptake.

A high feed uptake depends on the pig’s ability to absorb nutrients. A gut that is “well equipped” is more likely to absorb nutrients effectively, thus ensuring better feed use. The trial shows that zinc oxide and EP100i both have positive intestinal mucosa development, whereas villi and crypts developed larger in pigs – both significantly better than the control group.

Builds an armour against pathogenic bacteria

The thickness of the gut barrier or lining shows how effectively it prevents causative bacteria from finding their way into the bloodstream of the pigs. The barrier works as armour against bacteria causing illness. The trial showed that pigs fed with fermented protein significantly improved the thickness of the gut barrier compared to the control group. Zinc had a less positive effect on the lining compared to EP100i.

Zinc causes inflammation

Gut inflammation is a widespread problem in pig production. Zinc oxide treats diarrhoea effectively, but it is also – like antibiotics – a generous contributor to gut inflammation. When sampling the tissue of the piglets from the three different feed regimes, we found that pigs fed on zinc oxide had a less developed immune system than EP100i, and the zinc oxide pigs suffered from severe gut inflammation.

“The use of zinc simply pushes the problem to a later stage in the pig production and ensures a continues need for antibiotics as the pig has no immune system left to fight of infections. The solution is antibiotics that contributes to an even weaker gut barrier, making room for further bacteria to enter the blood stream. It is a vicious circle, that we attempt to fight with the use of lactic acid fermented protein”, Jens Legarth argues.

Fermented protein pays off

The product EP100i has been tested in several pig productions, and the overall results have been the same. Fermented plant protein can replace more expensive proteins like fishmeal and blood plasma and, at the same time, replace zinc oxide without compromising the production results. As a result, pig farmers can save both the expensive animal protein and the cost of zinc oxide. That’s why plant protein pays off.


Finsk kødproducent foran i klimaløbet
Skiftede soja ud med fermenteret rapsskrå
Hjælper griseproducenter med at sænke klimaaftrykket i foder
Avler sundhed med lokalt protein
Ædetræning af pattegrise


European Protein er en dansk familieejet protein producent. Vi arbejder for at fremme sundheden og produktiviteten for dyr igennem funktionelle og bæredygtige proteiner. Virksomheden blev grundlagt i 2011, og har i dag produktion i både Danmark, Ukraine og USA.

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